* src/port.h (struct PORT): added field gp_tags, to hold the tag

* src/port.h (struct PORT): added field gp_tags, to hold the tag
value of generic pointers,
* src/avr/main.c,
src/ds390/main.c,
src/hc08/main.c,
src/izt/i186.c,
src/izt/tlcs900h.c,
src/mcs51/main.c,
src/pic/main.c,
src/pic16/main.c,
src/xa51/main.c,
src/z80/main.c: PORT structure, added elements for gp_tags field,
* src/SDCCsymt.h: replaced hardwired values of GPTYPE_* macros with
fields in the PORT structure of each port,
* src/SDCCast.c (decorateType): allow processing of generic pointers
for PIC16 port (FPTRSIZE equals GPTRSIZE), also set GPTYPE_NEAR for
S_FIXED symbols

git-svn-id: https://sdcc.svn.sourceforge.net/svnroot/sdcc/trunk/sdcc@4223 4a8a32a2-be11-0410-ad9d-d568d2c75423